Lee Crawfurd was watching The Book of Mormon musical when something clicked—the full-time missionary program of The Church of Jesus Christ of Latter-day Saints could be considered a “natural experiment.” Crawfurd is not a member of the Church. He is an economist who seeks to understand why some people are more interested in helping people in poor countries than others. Crawfurd, who has worked with a few members of the Church who served missions, recognized while watching the play that, unlike many international volunteers who choose where they will go, prospective missionaries face uncertainty. They could learn Swahili to serve in Africa or Portuguese to serve in Portugal or preach the gospel in their own language or own country. Prospective missionaries only know one thing for certain: they will go and do (see 1 Nephi 3:7).
